Which of the following traits is not characteristic of arthropods?
a. jointed appendages
b. hardened exoskeleton
c. specialized developmental stages
d. lack segmentation
d
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Most of the water vapor in the Earth's atmosphere comes from evaporation from ____
a. lakes b. rivers c. land d. oceans e. plants
__________ such as reptiles control core temperature mainly by behavior. Fill in the blank(s) with the appropriate word(s)
A key component that is always important in the proper functioning of the immune system is:
a. direct cell to cell contact. b. hormonal action. c. communication between cells. d. antibody action. e. perforins
Two categories of organic compounds typically provide energy for living systems. Representatives of these two classes are
A) lipids and proteins. B) carbohydrates and lipids. C) carbohydrates and nucleic acids. D) carbohydrates and proteins. E) proteins and nucleic acids.